CA1221237A - Slag trap for high pressure coal gasification - Google Patents
Slag trap for high pressure coal gasificationInfo
- Publication number
- CA1221237A CA1221237A CA000462559A CA462559A CA1221237A CA 1221237 A CA1221237 A CA 1221237A CA 000462559 A CA000462559 A CA 000462559A CA 462559 A CA462559 A CA 462559A CA 1221237 A CA1221237 A CA 1221237A
- Authority
- CA
- Canada
- Prior art keywords
- synthesis gas
- slag
- water
- high pressure
- inlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000002893 slag Substances 0.000 title claims abstract description 68
- 239000003245 coal Substances 0.000 title claims abstract description 9
- 238000002309 gasification Methods 0.000 title abstract description 6
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 58
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 58
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 230000003134 recirculating effect Effects 0.000 claims abstract description 6
- 230000000717 retained effect Effects 0.000 claims description 3
- 238000010791 quenching Methods 0.000 abstract description 2
- 230000000171 quenching effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 41
- 230000004048 modification Effects 0.000 description 12
- 238000012986 modification Methods 0.000 description 12
- 239000004071 soot Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 239000002918 waste heat Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
SLAG TRAP FOR HIGH PRESSURE COAL GASIFICATION
ABSTRACT
A slag trap structure is for use where synthesis gas is generated having small particulate slag entrained therewith.
It has a high pressure shell with a body of water at the bottom for quenching and removing the slag. There is a coaxial inner wall to direct the flow of synthesis gas and slag down from an inlet at the top toward the body of water.
And there is an outlet spaced substantially above the level of the water to cause reversal of the gas and slag flow.
Also, there is means for recirculating some clean gas in conjunction with the inner wall to direct a swirling flow that confines the downward flow centrally in the vessel.
-I-
ABSTRACT
A slag trap structure is for use where synthesis gas is generated having small particulate slag entrained therewith.
It has a high pressure shell with a body of water at the bottom for quenching and removing the slag. There is a coaxial inner wall to direct the flow of synthesis gas and slag down from an inlet at the top toward the body of water.
And there is an outlet spaced substantially above the level of the water to cause reversal of the gas and slag flow.
Also, there is means for recirculating some clean gas in conjunction with the inner wall to direct a swirling flow that confines the downward flow centrally in the vessel.
-I-
Description
BACKGROUND OF THE INVENTION
Field of the Invention:
This invention concerns coal gasification and the like that employs a high pressure procedure which generates small particulate slag tha~ becomes entrained with the synthesis gas generated. More particularly the invention concerns a slag trap structure that is particularly adaptable to the foregoing high pressure gasification procedure.
Description of the Prior Art It has been found that in the generation of synthesis gas from finely divided materials, such as powdered coal, the use of a high pressure synthesis gas generator tends to develop slag that is only partially removed in a liquid state by run off from the reactor. And, the process also tends to develop a substantial quantity of small particulate slag that becomes entrained with the synthesis gas as it is produced. Such small particulate slag tends to be carried over with the synthesis gas to equipment which follows such as a waste hPat boiler. And, in such equipment the slag tends to deposit out and foul the boiler tubes or the like.
Consequently, it is an object of this invention to provide a slag trap structure which énables the small particulate slag that is entrained with synthesis gas, to be removed in a high pressure vessel where some clean synthesis gas is recirculated to assist in the removal process.
SUMMARY OF THE INVENTION
Briefly, the invention is in combination with high pressure coal gasi.fication and the like where small particulate slag is generated. It concerns a slag trap ;237 which comprises a high pressure vessel having an inlet at the top for receiving synthesis gas containing small particulate slag entrained therewith, said vessel comp.rising a shell for containing said high pressure,means for maintaining a body of water at the bottom of said shell underneath said inlet, first coaxial wall means for confining said synthesis gas and entrained slag to downward flow toward said body of water, comprising a plurality of passages therethrough for directing swirling flow therein, means for recirculating some of said synthesis gas through said plurality of passages, comprising a second coaxial wall between said shell and said first coaxial wall means, annular means for clos'ing the space between said first coaxial wall means and said second coaxial wall means, an inlet to said space for introducing said recirculated synthesis gas comprising a plurality of tangentially direeted conduits, and an outlet for said synthesis gas spaeed substantially above the bottom of said first and seeond eoaxial wall means to eause reversal of said synthesis gas and entrained slag flow above said body of water whereby said slag is quenehed and retained by said water while the synthesis gas flows to said outlet.
BRIEF DESCRIPTION OF THE DRAWINGS
The foregoing and other benefits of the invention will be more fully set forth below in eonneetion with the best mode eontemplated by the inventors of carrying out the invention, and in connection with whieh there are illustrations ,~,~. ~
~IL2;~
provided in the drawlngs, wherein:
Figure 1 is a schematic diagram illustrating a system in which a slag trap according to the invention is included;
Figure 2 is a schematic longitudinal cross section taken along the lines 2-2 on Figure 3 showing one modification of a slag trap structure according to the invention;
Figure 3 is a reduced horizontal cross section view taken along the lines 3-3 of Figure 2 and looking in the direction of the arrows;
, ~ ~
~L2212~7 Figure 4 is a schematic longitunal cross section showing of another modification of structure according to the invention. It has the slag trap structure attached beneath a generator of the synthesis gas and slag, and Figure 5 is a horizontal cross section view taken along the lines 5-5 of the Figure 4 modification.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In high pressure coal gasification procedures which employ gasification of finely divided solids such as powdered coal, the procedure develops liquid slag some of which tends to be entrained in finely divided form with the synthesis gas whlch exits from the generator. As the synthesis gas with entrained small particulate slag is ~ cooled the slag tends to deposit out on the ~surfaces of a structure following the generator, s~ch as a waste heat boiler. Consequently, the efficacy of the boiler is greatly reduced and the boiler tubes tend to become fouled.
However, by employing a slag trap according to this invention the entrained slag may be confined to the center of a swirling fluid flow that is directed toward a body of water. Thus the slag is thrown out and quenched by the water as the flow of gas and slag is reversed. This takes place without substantial deposit of the slag on any sùrface of the slag trap.
The arrangement involves the recirculation of some clean synthesis gas following the removal of the slag. And, a system wherein a slag trap according to this invention is employed is illu!trated in Figure 1. Thus, there is illustrated a high pressure synthesis gas reactor 11 from which the synthesis gas generated therein (having entrained _5_ ~Z2:1237 small particulate slag therewith) flows over a conduit 12 into the top of a slag trap 13. It then goes out from the slag trap 13 at a point well above the bottom and over an exit conduit 16 which leads to a waste heat boiler 17. Thereafter it continues on over a conduit 20 for utilization while a portion is recirculated over a return line 21 to the input side of a compressor 24 which is driven by a motor 23. The compressor 24 returns that portion of the clean synthesis gas dekermined by the relative size of the return line 21, to a return conduit 25 which leads back into the slag trap 13. Such return is carried out in a manner that will be more fully described hereafter in connection with the details of the slag trap .
A slag trap according to the invention may take different forms, e.g. the two modifications that are illustrated. One modification is illustrated by Figures 2 and 3, while Figures 4 and 5 show another.
~ith reference to Figures 2 and 3, it be noted that the slag trap according to this modification include a high pressure vessel 28 that is cylindrical and has an inlet 29 axially located at the top. It will be understood that the synthesis gas containing small particulate slag entrained therewith, is introduced through the inlet 29 and is directed down through the center of the vessel 28.
The Vessel 28 is made up of a shell 32 that contains the high pressure condition of the synthesis gas flowing therein. The shell 32 is shaped at the bottom in any~
feasible manner, such as a frusta conical portion 33 which contains a body of water 34 therein. There is of course, an inlet 37 on one side of the bottom portion 33 for introducing added water when necessary.
Also, there may be a lock hopper (not shown) connected to an outlet 38 at the bottom of the portion 33 which contains the body of water 34. There i5 a valve 41 to regulate the removal o water and quenched slag to the lock hopper.
Inside the shell 32 there is a refractory material coaxial wall 42 that confines the flow of synthesis gas with entrained slag downward within the shell 32, towards the body of water 34. This refractory wall 42 has a plurality of passages 45 that are tangentially directed through the refractory wall structure 42. Outside of the refractory wall 42 there is a s~econd coaxial wall 46 that is between the shell 32 and the refractory wall 42, so as to form a space 47 there between. The wall 46 connects into the top of the shell 32. And, there is an annular bottom connection 50 that closes the space 47. There is an inlet to the space 47, that is formed by a pair of tangentially directed conduits 51 and 52 (see Fig.3). These conduits 51 and 52 are connected to a source of clean synthesis gas. Such a source is indicated by the line 25 shown in Figure 1. It may be noted that the conduits 51 and 52 help in providing the desired swirling flow of the recirculating synthesis gas.
This flow goes circumferentially around in the space 47 and so through the tangential passages 45 to cause a swirling flow in the center of the slag trap 28. Such swirling flow acts to confine the particulate slag to the central portion of the trap 28 and keep it from depositing out on the 0 surfaces of the refractory wall 42.
The shell 32 has an outlet 55 that is spaced substantially above the bottom of the coaxial refractory wall 42 so as to cause a reversal of flow of the synthesis gas with entrained particles. This reversal takes place at the surface of the water 34 where it then flows upward in an annular space 56 in order to reach the outlet 55. It will be understood that if the slag trap 28 is employed in a system such as that indicated in Figure 1, the outlet 55 would be connected to the exit conduit 16 and the clean synthesis gas would then go to the waste heat boiler 17.
Thereafter a portion would be recirculated so as to return in the above indicated manner through the tangentially directed inlet conduits 51 and 52.
Another modification of a slag trap in accordance with this invention is illustrated in Figures 4 and 5. It will be observed that this trap structure is adapted for mounting directly beneath a synthesis gas generator 60. Consequently it receives the synthesis gas with small particulate slag entrained therewith, directly from the bottom exit of the ~enerator 60. In this modification, the trap consist of a shell;61 that is connected into the bottom of the generator 60 so as to form~an inlet 62 at the top of the shell 61.
There is~a coaxial wall 65 inside the shell 61. And, this coaxial wall 65 is made up of water tubes 66 that are s'naped at the top and connected into a manifold 67. Consequently, the wall 65 may act as a steam generator in absorbing radiant heat from the synthesis gas and entrained slag. The heat transfer takes place inside of the vessel formed by the shell 61.
~22~
There are a plurality passages through the wall 65 that is formed by tubes the 66. These passages are made up of a plurality of soot blowers 70. These soot blowers 70 are schematically indicated, and they may take various well known forms. However, the exit nozzles (not shown) of the soot blowers 70 are directed in a tangential manner inside of the wall 65. Consequently, clean synthesis gas may be directed through the soot blowers 70 so as to cause a swirllng flow inside. Such swirling flow will confine the slag containing synthesis gas coming from the geperator 60, to the central portion of the vessel 61.
It will be understood that clean synthesis gas being recirculated will be connected to the soot bIowers 70 by any feasible connection (not shown). And, preferably the tangential direction of the clean recirculated synthesis gas will be such as to oppose the circulation that would tend to be developed by gravity and the earths rotation.
In the modi~ied trap structure of Figures 4 and 5 there is~ a bottom structure (not shown), for containinq a body of water (not shown), in a manner similar to that indicated in 20~ the earlier described modification illustrated by Figures 2 and 3. Also, it will be noted that there is an outlet 73 through the shell 61. And, the outlet 73 is located a substantial distance above the surface of the body of water (not shown) so as to cause a reversal of the flow of the synthesis gas and entrained sIag. Such reversal takes place at the bottom (not shown) of the water wall 65.
It will be observed that in both modifications according to this invention, there is a slag trap structure ~;2Z~237 which is adapted for making use of the recirculation of some of the synthesis gas from a generator to provide a swirling effect in the trap. Andt such swirl confines the synthesis gas ladden with particulate slag to the center portion of S the trap while directing it down toward a body of water where the flow reversal tends to remove and quench the particulate slag that is entrained therewith.
It will be noted that in the modification illustrated by Figures 4 and 5, the hot combustion chamber synthesis gas products are used to generate steam, while at the same time the gases are cooled. Such water walled structure replaces the refractory wall of the modification illustrated in Figures 2 and 3 and the inlet swirl in Figures 4 and 5 is created by alming the soot blower nozzles to cause lS tangential flow. It may also be noted that the flow of recirculated synthesis qas through the soot blowers might be alternated between various inlet ports (not shownj o~ the .
soot blowers, if desired.
While particular embodiments of the invention have been ~20 descrlbed above in accordanc with the applicable statues, this is not to be taken as in any way limiting the invention :
but merely as being descriptive thereof.
:: :
::
Field of the Invention:
This invention concerns coal gasification and the like that employs a high pressure procedure which generates small particulate slag tha~ becomes entrained with the synthesis gas generated. More particularly the invention concerns a slag trap structure that is particularly adaptable to the foregoing high pressure gasification procedure.
Description of the Prior Art It has been found that in the generation of synthesis gas from finely divided materials, such as powdered coal, the use of a high pressure synthesis gas generator tends to develop slag that is only partially removed in a liquid state by run off from the reactor. And, the process also tends to develop a substantial quantity of small particulate slag that becomes entrained with the synthesis gas as it is produced. Such small particulate slag tends to be carried over with the synthesis gas to equipment which follows such as a waste hPat boiler. And, in such equipment the slag tends to deposit out and foul the boiler tubes or the like.
Consequently, it is an object of this invention to provide a slag trap structure which énables the small particulate slag that is entrained with synthesis gas, to be removed in a high pressure vessel where some clean synthesis gas is recirculated to assist in the removal process.
SUMMARY OF THE INVENTION
Briefly, the invention is in combination with high pressure coal gasi.fication and the like where small particulate slag is generated. It concerns a slag trap ;237 which comprises a high pressure vessel having an inlet at the top for receiving synthesis gas containing small particulate slag entrained therewith, said vessel comp.rising a shell for containing said high pressure,means for maintaining a body of water at the bottom of said shell underneath said inlet, first coaxial wall means for confining said synthesis gas and entrained slag to downward flow toward said body of water, comprising a plurality of passages therethrough for directing swirling flow therein, means for recirculating some of said synthesis gas through said plurality of passages, comprising a second coaxial wall between said shell and said first coaxial wall means, annular means for clos'ing the space between said first coaxial wall means and said second coaxial wall means, an inlet to said space for introducing said recirculated synthesis gas comprising a plurality of tangentially direeted conduits, and an outlet for said synthesis gas spaeed substantially above the bottom of said first and seeond eoaxial wall means to eause reversal of said synthesis gas and entrained slag flow above said body of water whereby said slag is quenehed and retained by said water while the synthesis gas flows to said outlet.
BRIEF DESCRIPTION OF THE DRAWINGS
The foregoing and other benefits of the invention will be more fully set forth below in eonneetion with the best mode eontemplated by the inventors of carrying out the invention, and in connection with whieh there are illustrations ,~,~. ~
~IL2;~
provided in the drawlngs, wherein:
Figure 1 is a schematic diagram illustrating a system in which a slag trap according to the invention is included;
Figure 2 is a schematic longitudinal cross section taken along the lines 2-2 on Figure 3 showing one modification of a slag trap structure according to the invention;
Figure 3 is a reduced horizontal cross section view taken along the lines 3-3 of Figure 2 and looking in the direction of the arrows;
, ~ ~
~L2212~7 Figure 4 is a schematic longitunal cross section showing of another modification of structure according to the invention. It has the slag trap structure attached beneath a generator of the synthesis gas and slag, and Figure 5 is a horizontal cross section view taken along the lines 5-5 of the Figure 4 modification.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In high pressure coal gasification procedures which employ gasification of finely divided solids such as powdered coal, the procedure develops liquid slag some of which tends to be entrained in finely divided form with the synthesis gas whlch exits from the generator. As the synthesis gas with entrained small particulate slag is ~ cooled the slag tends to deposit out on the ~surfaces of a structure following the generator, s~ch as a waste heat boiler. Consequently, the efficacy of the boiler is greatly reduced and the boiler tubes tend to become fouled.
However, by employing a slag trap according to this invention the entrained slag may be confined to the center of a swirling fluid flow that is directed toward a body of water. Thus the slag is thrown out and quenched by the water as the flow of gas and slag is reversed. This takes place without substantial deposit of the slag on any sùrface of the slag trap.
The arrangement involves the recirculation of some clean synthesis gas following the removal of the slag. And, a system wherein a slag trap according to this invention is employed is illu!trated in Figure 1. Thus, there is illustrated a high pressure synthesis gas reactor 11 from which the synthesis gas generated therein (having entrained _5_ ~Z2:1237 small particulate slag therewith) flows over a conduit 12 into the top of a slag trap 13. It then goes out from the slag trap 13 at a point well above the bottom and over an exit conduit 16 which leads to a waste heat boiler 17. Thereafter it continues on over a conduit 20 for utilization while a portion is recirculated over a return line 21 to the input side of a compressor 24 which is driven by a motor 23. The compressor 24 returns that portion of the clean synthesis gas dekermined by the relative size of the return line 21, to a return conduit 25 which leads back into the slag trap 13. Such return is carried out in a manner that will be more fully described hereafter in connection with the details of the slag trap .
A slag trap according to the invention may take different forms, e.g. the two modifications that are illustrated. One modification is illustrated by Figures 2 and 3, while Figures 4 and 5 show another.
~ith reference to Figures 2 and 3, it be noted that the slag trap according to this modification include a high pressure vessel 28 that is cylindrical and has an inlet 29 axially located at the top. It will be understood that the synthesis gas containing small particulate slag entrained therewith, is introduced through the inlet 29 and is directed down through the center of the vessel 28.
The Vessel 28 is made up of a shell 32 that contains the high pressure condition of the synthesis gas flowing therein. The shell 32 is shaped at the bottom in any~
feasible manner, such as a frusta conical portion 33 which contains a body of water 34 therein. There is of course, an inlet 37 on one side of the bottom portion 33 for introducing added water when necessary.
Also, there may be a lock hopper (not shown) connected to an outlet 38 at the bottom of the portion 33 which contains the body of water 34. There i5 a valve 41 to regulate the removal o water and quenched slag to the lock hopper.
Inside the shell 32 there is a refractory material coaxial wall 42 that confines the flow of synthesis gas with entrained slag downward within the shell 32, towards the body of water 34. This refractory wall 42 has a plurality of passages 45 that are tangentially directed through the refractory wall structure 42. Outside of the refractory wall 42 there is a s~econd coaxial wall 46 that is between the shell 32 and the refractory wall 42, so as to form a space 47 there between. The wall 46 connects into the top of the shell 32. And, there is an annular bottom connection 50 that closes the space 47. There is an inlet to the space 47, that is formed by a pair of tangentially directed conduits 51 and 52 (see Fig.3). These conduits 51 and 52 are connected to a source of clean synthesis gas. Such a source is indicated by the line 25 shown in Figure 1. It may be noted that the conduits 51 and 52 help in providing the desired swirling flow of the recirculating synthesis gas.
This flow goes circumferentially around in the space 47 and so through the tangential passages 45 to cause a swirling flow in the center of the slag trap 28. Such swirling flow acts to confine the particulate slag to the central portion of the trap 28 and keep it from depositing out on the 0 surfaces of the refractory wall 42.
The shell 32 has an outlet 55 that is spaced substantially above the bottom of the coaxial refractory wall 42 so as to cause a reversal of flow of the synthesis gas with entrained particles. This reversal takes place at the surface of the water 34 where it then flows upward in an annular space 56 in order to reach the outlet 55. It will be understood that if the slag trap 28 is employed in a system such as that indicated in Figure 1, the outlet 55 would be connected to the exit conduit 16 and the clean synthesis gas would then go to the waste heat boiler 17.
Thereafter a portion would be recirculated so as to return in the above indicated manner through the tangentially directed inlet conduits 51 and 52.
Another modification of a slag trap in accordance with this invention is illustrated in Figures 4 and 5. It will be observed that this trap structure is adapted for mounting directly beneath a synthesis gas generator 60. Consequently it receives the synthesis gas with small particulate slag entrained therewith, directly from the bottom exit of the ~enerator 60. In this modification, the trap consist of a shell;61 that is connected into the bottom of the generator 60 so as to form~an inlet 62 at the top of the shell 61.
There is~a coaxial wall 65 inside the shell 61. And, this coaxial wall 65 is made up of water tubes 66 that are s'naped at the top and connected into a manifold 67. Consequently, the wall 65 may act as a steam generator in absorbing radiant heat from the synthesis gas and entrained slag. The heat transfer takes place inside of the vessel formed by the shell 61.
~22~
There are a plurality passages through the wall 65 that is formed by tubes the 66. These passages are made up of a plurality of soot blowers 70. These soot blowers 70 are schematically indicated, and they may take various well known forms. However, the exit nozzles (not shown) of the soot blowers 70 are directed in a tangential manner inside of the wall 65. Consequently, clean synthesis gas may be directed through the soot blowers 70 so as to cause a swirllng flow inside. Such swirling flow will confine the slag containing synthesis gas coming from the geperator 60, to the central portion of the vessel 61.
It will be understood that clean synthesis gas being recirculated will be connected to the soot bIowers 70 by any feasible connection (not shown). And, preferably the tangential direction of the clean recirculated synthesis gas will be such as to oppose the circulation that would tend to be developed by gravity and the earths rotation.
In the modi~ied trap structure of Figures 4 and 5 there is~ a bottom structure (not shown), for containinq a body of water (not shown), in a manner similar to that indicated in 20~ the earlier described modification illustrated by Figures 2 and 3. Also, it will be noted that there is an outlet 73 through the shell 61. And, the outlet 73 is located a substantial distance above the surface of the body of water (not shown) so as to cause a reversal of the flow of the synthesis gas and entrained sIag. Such reversal takes place at the bottom (not shown) of the water wall 65.
It will be observed that in both modifications according to this invention, there is a slag trap structure ~;2Z~237 which is adapted for making use of the recirculation of some of the synthesis gas from a generator to provide a swirling effect in the trap. Andt such swirl confines the synthesis gas ladden with particulate slag to the center portion of S the trap while directing it down toward a body of water where the flow reversal tends to remove and quench the particulate slag that is entrained therewith.
It will be noted that in the modification illustrated by Figures 4 and 5, the hot combustion chamber synthesis gas products are used to generate steam, while at the same time the gases are cooled. Such water walled structure replaces the refractory wall of the modification illustrated in Figures 2 and 3 and the inlet swirl in Figures 4 and 5 is created by alming the soot blower nozzles to cause lS tangential flow. It may also be noted that the flow of recirculated synthesis qas through the soot blowers might be alternated between various inlet ports (not shownj o~ the .
soot blowers, if desired.
While particular embodiments of the invention have been ~20 descrlbed above in accordanc with the applicable statues, this is not to be taken as in any way limiting the invention :
but merely as being descriptive thereof.
:: :
::
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In combination with a high pressure coal gasifier where small particulate slag is generated, a slag trap comprising a high pressure vessel having an inlet at the top for receiving synthesis gas containing small particulate slag entrained therewith, said vessel comprising a shell for containing said high pressure, means for maintaining a body of water at the bottom of said shell underneath said inlet, first coaxial wall means for confining said synthesis gas and entrained slag to downward flow toward said body of water, comprising a plurality of passages therethrough for directing swirling flow therein, means for recirculating some of said synthesis gas through said plurality of passages, comprising a second coaxial wall between said shell and said first coaxial wall means, annular means for closing the space between said first coaxial wall means and said second coaxial wall means, an inlet to said space for introducing said recirculated synthesis gas comprising a plurality of tangentially directed conduits, and an outlet for said synthesis gas spaced substantially above the bottom of said first and second coaxial wall means to cause reversal of said synthesis gas and entrained slag flow above said body of water whereby said slag is quenched and retained by said water while the synthesis gas flows to said outlet.
2. The invention according to claim 1, wherein said first coaxial wall means comprises a refractory cylindrical wall connected to said synthesis gas inlet at the top and open at the bottom above said body of water.
3. The invention according to claim 2, wherein said plurality of passages are tangentially directed.
4. In combination with a high pressure coal gasifier where small particulate slag is generated, a slag trap comprising a high pressure vessel having an inlet at the top for receiving synthesis gas containing small particulate slag entrained therewith, said vessel comprising a shell for containing said high pressure, means for maintaining a body of water at the bottom of said shell underneath said inlet, a refractory coaxial wall connected to said synthesis gas inlet at the top and open at the bottom above said body of water, for confining said synthesis gas and entrained slag to downward flow toward said body of water, said wall having a plurality of tangentially directed passages therethrough for causing a swirling flow therein, an outlet for said synthesis gas spaced substantially above the bottom of said coaxial wall to cause reversal of said synthesis gas and entrained slag flow above said body of water whereby said slag is quenched and retained by the water while clean synthesis gas flows to said outlet, means for recirculating some of said clean synthesis gas through said plurality of passages, said means for recirculating comprises an additional coaxial wall between said shell and said coaxial wall means, annular means for closing the space between said coaxial wall means and said additional coaxial wall, and an inlet to said space for introducing said recirculated clean synthesis gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000462559A CA1221237A (en) | 1984-09-06 | 1984-09-06 | Slag trap for high pressure coal gasification |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000462559A CA1221237A (en) | 1984-09-06 | 1984-09-06 | Slag trap for high pressure coal gasification |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1221237A true CA1221237A (en) | 1987-05-05 |
Family
ID=4128660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000462559A Expired CA1221237A (en) | 1984-09-06 | 1984-09-06 | Slag trap for high pressure coal gasification |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1221237A (en) |
-
1984
- 1984-09-06 CA CA000462559A patent/CA1221237A/en not_active Expired
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